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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911883d5dba99113ac6bd8fdad18ab241ec1bec8e611730a999c332d1c7e2de7' 
  AND token = 's0qYiUCWd9CrYd8obnw1sMzF1ynOVyNjdKlRCXFYtts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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