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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdd077ccedb5fdb0e836b74c29f11430423242bfde9ea0bbee81cf9a19a4bb8' 
  AND token = '8bNizyAM08A1Ed2CJkap0MOsbX4pR59KkzB848L0GnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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