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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e74d7ba05e247fe61290e09b16fed70fe9bf0265291890529faf76f2cfeba47' 
  AND token = 'S5gI2OBR0fnPv/FJ/9T0XHnMmF8Xgw8aNeEywtvxmeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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