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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38318e64b065430137b6ca2e50d35478f1f45c5a6d7f24a6ddc467a04260db32' 
  AND token = 'SKDSv9sAV0o+yu6PS28Lv6//Sskpt0LGISzf0XTGYxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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