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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af40314347e6fa7332b89e31e44d4cd994df668961fbc9f8af7e256983a1a613' 
  AND token = 'FDbbZCfQzulaIZBP9EixWX9qsVtaUXto2c4zhOg9ZWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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