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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbb494a7ef0232f8d82c19c45558ffd240476cb702151909fa0719a1c650898' 
  AND token = 'xadq9AvSEMEf4Kxdd1+lcZIlHfAsoJTHX1Op07NZYPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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