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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d833b742bd6e25e147007cbd42a157fb304692c539edf565bed0f2f7484eda' 
  AND token = 'y+b4wnACw8e8sdzz4C5FbTz9/lgNB4HT0wTE5uLNAeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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