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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd49bc48d175a228a624b58635476783447d643fdeb904f1f5ae04a19cac141e' 
  AND token = 'cOmcswTRIJIp/TiR50J+WkdfzlHNcangiaPY0H2mZcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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