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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b00d142059008c275ca8d865f0316278585eff32f9df4526064ecce5b0687d' 
  AND token = '1VwHs86STDuqa0ZAmdfd0aa8/o9maPI3PlYsD2TAWBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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