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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dc00017cb08154cea1db25a6ca4cef582015c7784197d13e0c4d262429dae4' 
  AND token = 'pivwPJfMIYdbigwJGGC5r9L6yTetXQpo8E6PLyP0xSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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