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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ca2dcb49f60f0a9a9bd33f9a3e8276e505024349a3d1161c6bfc17d31502ca' 
  AND token = 'paDDi3Re5CmuWBk0I0g5fv19I+NWXDOiqu9vikcNxh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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