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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab889a57b3af3b7024563f1395aeb490ec45f2ac97c28e78a80396c07b1ecf9f' 
  AND token = 'OAYvMvGOROCxJ7Jx4/8lPv3ukhcorIm1VsShs4XLkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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