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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f711d58222bc08da1d011795b9da1dce587042f5b40be57dd07e3f7763c02033' 
  AND token = 'm/XmE/6rJqNlS6d4Pw92Rs4gbEboGtz27INxlOUc9sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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