SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682c4da572c3007e772b1b58b968445a26d111d001bb743718997bb8023b3af6' 
  AND token = 'xo/bg/qmtWPDj2g2Bn9T5FxzY9kvluvWWvJA+4xAsyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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