SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9911a60c9dda33885e8ee6f6177cd3de330fa756cf083631578b5b062b496b69' 
  AND token = 'vCiy+pGs/2iKL8Rn5C6vU4R489qJ7hpXi9LfgVYkyOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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