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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3f0c403fa6d5ce99453679b59d92aa59604dc65050dfce34dd14f25c7cb84c' 
  AND token = 'gA1wluoSSWsOmbjOKXwKf2EFiu8FsNmpiHRxm0KGyVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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