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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c475aaf84c7197428b25ec4f56ea398138a743dc014170d7be51bfb48dd8bb' 
  AND token = 'OTsTzkl+n7UmP39WXZhVhPdfJ+Me8yeCtQEZfzeUlVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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