SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f8a417c3e182196fac5a854d02355dcd3723d6d11550aebcb00766b2d8261b' 
  AND token = 'Xez+Rb+V6YYBVRRoF4UYVIp84/K/vUFiFO6y92vZ9yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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