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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370c1d3f0afe9a92a4aa15b544a0b2c11bc8269293889e9b3431a6ffddffded9' 
  AND token = 'K9kHnbHGHZFjBL1FATQ0NO6tDJGaeNsA1OdTUC/pteg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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