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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9602275bfdb6786775286ab5b6e16ea255a25d64ce8fb98ab328681d38dafb' 
  AND token = 'sIY21xFszb50zlh7cEK7Id9on0hG80O1Ip1UjIYNAJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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