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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b36abdeb71443d1ec80aa5e178149930ab2f4ae2e89e931c8958668a4759dea' 
  AND token = 'IgwkW8LvYjoXIwOk79TzqFBUu2ui3H8v+5FtDSk946E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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