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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411479dd038d2a4632799b8460bc28a378fffd1eee585b0333ab73d92073b56b' 
  AND token = 'kgd1KPkIfVoSyEooE0b3380/fAaeZb56jiabyetxrvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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