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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98001de8d0575d0d901e6d577b24760919360f39730b3ab7eb32a84a0d6cb87' 
  AND token = 'A69LKrIwmoIeqGCBf1plOYvc2QHKLXloWlia6+DO8gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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