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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035645e602139e5d5433aafa1a5fbd15df926a79e1a8aee6e7bce1ebcf3db231' 
  AND token = '1GOFwf0NfcVpq5AyKFsIhWK56M+ombkCOcZd/FTwDgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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