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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da67ccef3bb0ba74de619c60e3c2919ee533abdee2ec18036ab5259698a9d806' 
  AND token = '8enSr6wMhfBUAJekai/TNOxwxx7t0GA2TOSByQ6mUMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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