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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd228a92d9cae0d4599be03246bd698638863d80ff4a2cb21c7111c2a63610492' 
  AND token = 'sRnwFMK/yyblY6hInfsbd8e3KKC4J/hvYNV2htfeshs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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