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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a60d9d8173fa980bfc5f2a43bea5f1de7f552a38ea994a8e60e32dad9a23cd' 
  AND token = 'lhe/4hIbII+WuEA7k0JZyMoZlpX+ZJzbpDCmdS+B7CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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