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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af412328fad4c889215198628de742ee9ac54665de8362a3910f9adf21ac484' 
  AND token = 'Feyr90xuTFO33l6JNQv9xH7ZdQOkD3wwV1Y1KIUc810=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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