SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d2c82e938b42b7647c5bd414d99a3d48785073362b8a73691ea27c7d52901c' 
  AND token = 'GoqvPDsFusmZBH4BLpl60Yx25xBKXQJfiqMBkRqoHSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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