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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917e8718686ab2b60f89f987f93895bde47eaf08bf00645cfaac00bc78675575' 
  AND token = 'WXlnmGE8JWNfjLJFxal3f9FbF88mLclh+EOWWvQIJ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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