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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ee39f4653db481f49c6dec93fdbd7d56215d30d7c433ff3e595583bf630fca' 
  AND token = 'ymL5CajXCLQXcrBBwxmP2bBXt7w8xWpn0jckRO3HXhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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