SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb78ef3339ff58cd8edac6fbc95b295972f14412389d2c96a29aa45f33d13f7' 
  AND token = 'vQOyzUeSaPbf+FahBvqMUGiavW4CrFq50KRmVjPIN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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