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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d9b34f6ef5fb90cf54a9509814446fd3acd991fb5b0d9d56f17f99a910576c' 
  AND token = '4vtjYJXoyDph2zf03FGdHLYv9b8CrcoEXvDvuyLWYC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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