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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eb603cbf6d8de502668f28913209b7318446430a18bc506f8cf707165870e0' 
  AND token = '/QqM1x+/e9ZTfgqqoOzRlr4bitNbihuYzPV3XbAn7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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