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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f71a97d42e2f19f56ceb461d70dd0cf56695996a7f584ecab9e383999d3b26' 
  AND token = '8/0bZ9DLt1olSCRHc3XlN7yEEv3AOTNiQ0v/EkYNozE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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