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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05da169b3527995c10e48928656551427c2d0509a9064fb5524ff2b49eaae55e' 
  AND token = 'CRBpiXnHR6xfiSwy1uz56tMKcK67E8cKPC0sSchvTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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