SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489c15551df67b851d0bf0492a3b2c5f4686f124c7d38b61da00437ac840657a' 
  AND token = 'gQrAdR+KQO7ZTfyJi/mpA5F+zgE7+iAK987/1Yw6gzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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