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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da977608f434493b17723998ebcc9201a59e010ad5acfa7a82cfa54623b40002' 
  AND token = 'VORtH2nHvr83TLcojzQ8dTEw3KMkdna1ShnLjmlgI4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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