SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765cb371ffd21b64f09b9ca6b9e66ef8e57061962270d69be819686d8a160fef' 
  AND token = 'Cgo+XcMkgS/mpXJNWDghoytiFVTeFyqOtZnzkQBK/Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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