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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24e3b16c6b83aafdfcd5beb78f6f7720610f53996cbf0413023423daa5387e5' 
  AND token = 'OmXeA4Sh6r7ItUZveacUOB3fpMde8mKa9qGhV0sbLHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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