SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee66b293a7a2e09d05fb7d2bbc64a47a8a56f284736819316fff992aa8700af4' 
  AND token = 'ZWbP3jDhZdrNYooJQZgqVVr+l5FYOFOz496W5kdzHmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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