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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696742a7b6ea453c3aa10022a4e07bda84265f79a8af36e6f4f2b15bbd82b2d5' 
  AND token = 'XmqP8Moh7hQSdzUH0/aGUandfOBNBRp+FBZmBrNFIKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}