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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb82ce7511fd67c26fdfa87ecebeae95d9cb42b9138023b4d158673f546c2af' 
  AND token = 'lqv38BUvUKSFuIjodCVmWDOK5uMLOgEifH6e+n3dSkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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