SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa70f0c489a1841b08b2b9ad17b9e245a8d42b5e12ce0dabb7fc3bec0677c263' 
  AND token = 'uBm1p4nyYqhvbA4Yk8EWB5og9q9/TygdKpj+8sxVwr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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