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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0800d3deb2eeb4544f9d419c52480a8786f43f1ca30cf99fcc782bd428e744d4' 
  AND token = 'evOj1s2JsWzdlnF87c5jtjT2KZxe2EcQ0d75Bqy66Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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