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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe56eb5795d7ce39d64415843c4120bef60568f6cd3a73732300d8a6ae323181' 
  AND token = 'pIzp7HDbhWZlLaI+u5DuWRPIFjVCjtLco3fNCukhweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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