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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd21b66f835f804175fccb66c9a4f4d24acf3bc4d8f6f2416ba0ba8dca00e4b' 
  AND token = '/Ah5lfijIzDwqItfoe3q/RlXOLylKBUhhm+zZUA8OeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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