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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15b873dfd185de40d4929410582be3018e4efce6b5c66416d6c956485595687' 
  AND token = 'l3jTWrmzUNlnTl+e0o1DlUG5ezQpOG9vhiKGGwzMp1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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