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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4f7d11b7ba06e89b9bbc82fc81fc9f30f44ca457472423ce7edf5014e5711c' 
  AND token = 'zl4cI2iyLuEYu1rl68usbMUSasd+UmumXl+EQn1s8Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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