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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ba2de5283ec5506122dc82b5be28214d6a30e84b7daebb6cbc2307b2e86702' 
  AND token = '7Kct+/XOw9WSHWe22Vhi2moHpqV1cGG5X2s0VV1r62Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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