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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd515a11fcd3b9371a5310fde483068198de689fa9e8e4e78dbc021c7c488e8cc' 
  AND token = '00LobTEDTlJQjT3jYAyIUOy1z6KmXAN0xS7hPZuqNBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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