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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5e3ce7c30bdfd30e093d7b9157f1e83a4a6a5ded9b16375a982f354f11848f' 
  AND token = 'vlttMvzsagwpDpa9OMuJrcpraTPQ5SreP+VPHEyH7uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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