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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f35ce417a022717e3d41e1faadaf7446dbe707b8c6b9c84508656042836243' 
  AND token = '35jfF9omF3eUbeZD25saGNFsKZS5qrhBi5OKXe4O4RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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