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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62337a7000e10544a2bf301438634700e6259c2054eee8056ad2d064159e476' 
  AND token = 'CtZwqgDPWHUdLQB7URfY3pr2kW3hB3eCiECYLjU1AUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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