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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec49acf50a66d75300c3566f731c82455b04f67119eedb00ba2fccb11669eb94' 
  AND token = 'nAm9CDh8rdsG8todeuUnbYD1RxIpdcaPw8sf5ZF7vSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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